SwiftUI - ForEach within a Form doesn't update content, even though it gets stored correctly

I looked everywhere for a solution to my problem, but I couldn't find any. There's this question that is similar, but I think I'm having a different problem here. So, my code (Xcode 12.1, developing for iOS 14.0) looks like this:

import SwiftUI

struct ContentView: View {
    
    @ObservedObject var cm : FolderModel //Which is conformed to Codable, Identifiable, Equatable, ObservableObject
    @ObservedObject var dm : DataManager //Which is conformed to Equatable, Identifiable, ObservableObject
    @State var pressedFolder = false
    @State var valview : ValuesView
    
    
    NavigationView {
        VStack{
            ScrollView(.horizontal) {
                HStack { ForEach(dm.storageFolders) { foldersForEach in
                    Button(action: {
                        valview = ValuesView(cm: foldersForEach, dm: dm)
                        pressedFolder = true
                    }, label: {
                        Text(foldersForEach.folderName)})
                }
                
                if pressedFolder == false {
                    Form {
                        ForEach(dm.values) { passwordDelForEach in
                            NavigationLink(//This works correctly)
                        }
                    }
                    
                } else if pressedFolder == true {
                    valview //This is the thing that it's not updating when values are added to the folders
                }
                }
                
                

struct ValuesView : View {
                    
                    @ObservedObject var cm : FolderModel //Which is conformed to Codable, Identifiable, Equatable, ObservableObject
                    @ObservedObject var dm : DataManager //Which is conformed to Equatable, Identifiable, ObservableObject
                    
                    var body : some View {
                        Form {
                            ForEach (cm.folderValues) { folderValuesForEach in
                                NavigationLink(//This works correctly)
                            }
                        }
                    }
                }

The arrays into the DataManager are all declared like this:

@Published var storage : [StorageModel] = [] {
   didSet {
      objectWillChange.send()
      }
    }
typealias Storage = [StorageModel]

If I add anything into the arrays (from another View), data is stored correctly because by opening the .plist file (that the DataManager creates) I can see it gets correctly updated. Plus, every Button that I use has either the func of the DataManager save() (which has objectWillChange.send() within it) or I manually add dm.objectWillChange.send() to the action of the Button. Despite all this, the things into the ForEach don't update. I only see the things that were there the first time I open the app, and to see the changes I have to close the app and reopen it.

What am I doing wrong?

Thanks to everyone who will answer!